Define a new Diesel Model for PodcastCover querries.

Define new Diesel Model and impl From<Podcast> trait,
Change the signature of downloader::cache_image function,
Change and merge hammond-gtk::utils::get_pixbuf_from_path functions.

hammond-gtk/src/views/episodes.rs

@@ -6,7 +6,7 @@ use hammond_data::dbqueries;
 use hammond_data::EpisodeWidgetQuery;
 
 use widgets::episode::EpisodeWidget;
-use utils::get_pixbuf_from_path_64;
+use utils::get_pixbuf_from_path;
 
 use std::rc::Rc;
 
@@ -216,8 +216,8 @@ impl EpisodesViewWidget {
         let image: gtk::Image = builder.get_object("cover").unwrap();
 
         // FIXME:
-        if let Ok(pd) = dbqueries::get_podcast_from_id(episode.podcast_id()) {
-            let img = get_pixbuf_from_path_64(&pd);
+        if let Ok(pd) = dbqueries::get_podcast_cover_from_id(episode.podcast_id()) {
+            let img = get_pixbuf_from_path(&pd, 64);
             if let Some(i) = img {
                 image.set_from_pixbuf(&i);
             }

hammond-gtk/src/views/shows.rs

@@ -111,7 +111,7 @@ impl ShowsChild {
     fn init(&self, pd: &Podcast) {
         self.container.set_tooltip_text(pd.title());
 
-        let cover = get_pixbuf_from_path(pd);
+        let cover = get_pixbuf_from_path(&pd.clone().into(), 256);
         if let Some(img) = cover {
             self.cover.set_from_pixbuf(&img);
         };